Shadowrun: Vancouver Hipsters
The oldest of the megas, Shiawase holds the claim to fame of being behind the court case that ultimately led to the extraterritoriality that all megacorps know and love today. A classic Japanese zaibatsu, Shiawase is run in a traditional “family” style, with most employees signing lifetime contracts and even marrying within the corp. Families, however, tend to squabble—and a big squabble between the corp’s various (and interrelated) warring factions back during the Crash resulted in a huge shakeup, redistributing vast swaths of stock and rewriting the top levels of Shiawase’s org chart in one fell swoop.
As for what they do, a better question would be, “What don’t they do?” Either directly or through subsidiaries, Shiawase has its hands in nuclear power, environmental engineering, biotech, heavy industry, technical service, minerals, military goods, and a whole lot more.